firebird-mirror/src/common/utils.cpp

/*
 *  The contents of this file are subject to the Initial
 *  Developer's Public License Version 1.0 (the "License");
 *  you may not use this file except in compliance with the
 *  License. You may obtain a copy of the License at
 *  http://www.ibphoenix.com/main.nfs?a=ibphoenix&page=ibp_idpl.
 *
 *  Software distributed under the License is distributed AS IS,
 *  WITHOUT WARRANTY OF ANY KIND, either express or implied.
 *  See the License for the specific language governing rights
 *  and limitations under the License.
 *
 *  The Original Code was created by Claudio Valderrama on 25-Dec-2003
 *  for the Firebird Open Source RDBMS project.
 *
 *  Copyright (c) 2003 Claudio Valderrama
 *  and all contributors signed below.
 *
 *  All Rights Reserved.
 *  Contributor(s): ______________________________________.
 *
 */


// =====================================
// Utility functions


#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#else
#define __need_size_t
#include <stddef.h>
#undef __need_size_t
#endif

#include "../common/utils_proto.h"

namespace fb_utils
{

char* exact_name(char* const str)
{
/**************************************
 *
 *	f b _ e x a c t _ n a m e
 *
 **************************************
 *
 * Functional description
 *	Trim off trailing spaces from a metadata name.
 *	eg: insert a null after the last non-blank character.
 *
 *	SQL delimited identifier may have blank as part of the name
 *
 *	Parameters:  str - the string to terminate
 *	Returns:     str
 *
 **************************************/
	char* p = str;
	while (*p)
	    ++p;
	// Now, let's go back
	--p;
	while (p >= str && *p == '\x20') // blank character, ASCII(32)
		--p;
	*(p + 1) = '\0';
	return str;
}


char* exact_name_limit(char* const str, size_t bufsize)
{
/**************************************
 *
 *	f b _ e x a c t _ n a m e _ l i m i t
 *
 **************************************
 *
 * Functional description
 *	Trim off trailing spaces from a metadata name.
 *	eg: insert a null after the last non-blank character.
 *	It has a maximum length to ensure working between bounds.
 *
 *	SQL delimited identifier may have blank as part of the name
 *
 *	Parameters:  str - the string to terminate
 *               bufsize - the size of the variable containing the string.
 *	Returns:     str
 *
 **************************************/
	const char* const end = str + bufsize - 1;
	char* p = str;
	while (*p && p < end)
	    ++p;
	// Now, let's go back
	--p;
	while (p >= str && *p == '\x20') // blank character, ASCII(32)
		--p;
	*(p + 1) = '\0';
	return str;
}


int name_length(const TEXT* const name)
{
/**************************************
 *
 *	n a m e _ l e n g t h
 *
 **************************************
 *
 * Functional description
 *	Compute effective length of system relation name and others.
 *	SQL delimited identifier may contain blanks. Trailing blanks are ignored.
 *  Assumes input is null terminated.
 *
 **************************************/
	const TEXT* q = name - 1;
	for (const TEXT* p = name; *p; p++) {
		if (*p != ' ') {
			q = p;
		}
	}

	return (q + 1) - name;
}

} // namespace fb_utils